165664041550 has 24 divisors (see below), whose sum is σ = 352154420496. Its totient is φ = 56799099840.

The previous prime is 165664041511. The next prime is 165664041563. The reversal of 165664041550 is 55140466561.

It is a junction number, because it is equal to n+sod(n) for n = 165664041497 and 165664041506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236662567 + ... + 236663266.

It is an arithmetic number, because the mean of its divisors is an integer number (14673100854).

Almost surely, 2^165664041550 is an apocalyptic number.

165664041550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165664041550 is an abundant number, since it is smaller than the sum of its proper divisors (186490378946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165664041550 is a wasteful number, since it uses less digits than its factorization.

165664041550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473325852 (or 473325847 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 165664041550 in words is "one hundred sixty-five billion, six hundred sixty-four million, forty-one thousand, five hundred fifty".